indoor comfort quality. A full control
sequence is implemented to optimize
the passive system and make sure the
active system is adequately engaged
when necessary. The rooftop packaged units meet the graphical method
of Standard 55-2010. The overall
approach allows for flexibility at the
tenant level for any user requirements and allows for occupant comfort control if requested.
The building was designed to be net
positive with passive system. The
walls were externally insulated to a
value of R- 20 and the roof to R- 40.
All of the existing windows and exterior doors (except the north elevation) were replaced with dynamic
glass, electrochromic glazing that
tints automatically to reduce solar
gain to as low as 3%.
In addition, the design team works
with the architect to minimize the
infiltration load by well detailing
openings into the building.
A unique skylight design was
developed by the design firm. The
intent was to minimize the opening
areas on the roof for an effective passive system, as a good glass can only
insulate to the level of R- 5 when
compared to a R- 40 roof, especially
applying to the heating season. The
skylights face south and are tilted
toward the sun with a pyramid shape
to collect the maximum quantity of
daylight with the smallest aperture.
A diffusing film is applied on the
internal side of the glass to reduce
glare. This design using low-e glass
maintains the integrity of the high
The skylights are designed to provide 100% of necessary light to the
space during daylight hours most of
the year. To complement daylight
variation, the indoor lighting design
features individually dimmable LED
fixtures in a task-ambient design that
reduces fixture count and first cost.
The skylights are also operable
as part of the natural ventilation
scheme for the building, together
with the operable vertical view
TOTAL EUI OCTOBER 2014 –
ABOVE The building uses the existing
concrete walls as a thermal mass source.
Exterior insulation was added to increase
the impact of using this mass to maintain
RIGHT The project team coordinated the
lighting and fan layouts to prevent visual
disturbances due to strobe effect.
The layout of south-facing skylights and
roof-mounted PV system was optimized to
balance daylight and energy production.
HVAC Lighting PlugLoads